The invention discloses an aluminum alloy full-monocoque vehicle body which comprises a head, an underbody, a tail and a vehicle body top portion. The head, the underbody, the tail and the vehicle body top portion are fixedly connected with one another to form the complete aluminum alloy full-monocoque vehicle body. The head comprises a front crossbeam, a front upright column of a frame of an engine bin, longitudinal beams of the frame of the engine bin, a radiator beam and a front suspension system mounting seat, and the front crossbeam, the front upright column of the frame of the engine bin, the longitudinal beams of the frame of the engine bin, the radiator beam and the front suspension system mounting seat are fixedly connected with one another; the underbody comprises underbody crossbeams, lower edge beams, floors, front mudguards and underbody longitudinal beams which are fixedly connected with one another; the tail comprises lower crossbeams of a rear air window frame, a rear-end panel, rear wing panels, rear wheel covers, side beams of a frame of a trunk, side beams of the rear air window frame, upright columns of the trunk and rear suspension system mounting seats, and the lower crossbeams of the rear air window frame, the rear-end panel, the rear wing panels, the rear wheel covers, the side beams of the frame of the trunk, the side beams of the rear air window frame, the upright columns of the trunk and the rear suspension system mounting seats are fixedly connected with one another. The aluminum alloy full-monocoque vehicle body has functions of a vehicle frame and functions of a common vehicle body, and has the advantages of light weight and complete functions.